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Monmouthshire sits in the Met Office's south-west England and south Wales area. Each bar is one year's total; the dark line is the ten-year average, which is what a trend looks like once single wet and dry years are smoothed out; the dashed line is the 1991–2020 average of 1,277 mm. 2025 brought 1,292 mm, close to that. The wettest year here since 1996 was 2000 (1,619 mm), the driest 2003 (959 mm).
Rainfall over a whole region, not a measurement in Monmouthshire itself, and a wet year is not the same thing as a flood: what floods a river is how much falls at once and how wet the ground already was. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Year by year, each figure divided by what changed about the measuring — the gauge fleet, the flood areas on the register, the overflows monitored.
Monmouthshire, Environment Agency annual returns, 2021–2025
2021: 54.0 spills. 2025: 56.8 spills — 5.1% higher. That is two years compared, not a trend: the years in between jump about more than the difference between these two.
The raw count went from 108 to 227 spills between 2021 and 2025, while the monitored overflows went from 2 to 4 — which is what the chart divides by.
Only five years exist, so this is a comparison and not a trend. The number of monitored overflows grew across them, which is why the figure is per overflow. Spills also track the weather: 2022 was a drought summer, and it is one of only five years here, so it pulls the comparison about on its own.
See all four across the whole UK, and how to read them
Rebuilt on 26 October 2026, from data banked up to the end of 2026. Only whole calendar years are counted, so 2026 will appear here once it has finished. The rebuild runs weekly.
Each page brings together the river gauges, official flood warnings and recorded floods around that place.
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